I would have that on my previous BB, before I upgraded the OS. It just required me to remove the SIM, replace, and reboot - then be fine for a few days. After upgrading OS, never saw it again. Still the same SIM card in my new Curve, no more issues.
I just had this happen to me on Sunday. Luckily, I had another new SIM at home and they attached my info to the new card. They determined the old one was bad because it didn't work on another phone. I just about died because i couldn't use my BB! Lol
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